439 
Chemistry. — “The equilibrium solid-liquid-gas in binary systems 
which present mixed crystals’. (Third communication). By 
Prof. H. R. Kruyr and Dr. W. D. HELDERMAN. (Communicated 
by Prof. Ernst COHEN). 
(Communicated in the meeting of June 24, 1916). 
In two previous communications one of us') has discussed the 
three-phase equilibrium solid-liquid-gas for a binary system when 
a complete miscibility is possible in all phases; in connexion there- 
with the system p-dichlorobenzene — p dibromobenzene has then be 
investigated. These investigations led to the result that the three- 
phase line in such a system has usually a different course from 
that drawn previously *). The general shape proved to be such that 
on that line a maximum pressure occurs. In Fig. 1 has been drawn 
73 
72 
77 
10 
Kiger, 
a combined PZ’ and Ze projection for the just mentioned system 
whereas in Fig. 2 the spacial figure is indicated on P, 7, x coordi- 
nates for this type. 
It will be superfluous to describe this figure in detail. Its meaning 
is plain to any one familiar with the normal figure from BAKHurs 
RoozreBoom’s Heterogene Gleichgewichte *). 
It is distinguished from the figure mentioned above‘) by the 
1) H. R. Kruyr, Proc. 18, 542 (1909) and 19, 32 (1910). 
2) H. W. Bakuuis Roozesoom, Archives Neerlandaises [2] 5, 360 (1900). 
3) 2e Heft pg. 105 (Braunschweig 1904). 
4) loc. cit. previous pg. note 2. The figure is also reproduced by H. R. Kruvyr, 
Zeitschr. f. physik. Chem. 79, 657 (1912), Fig. i. 
